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Method for preparing xylose and arabinose by hydrolyzing lignocellulose

A technology of lignocellulose and arabinose, applied in the field of bioengineering, can solve the problems of high toxicity of trifluoroacetic acid and trifluoromethanesulfonic acid, no catalyst recovery and reuse, and difficult industrial application, etc., achieving significant economic and social value, Reduced equipment investment and fewer side effects

Inactive Publication Date: 2009-09-09
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, organic solvents are used to extract lignin, the process is complicated and the production cost is high
Chinese patent 99805686.3 discloses a method for preparing L-arabinose by hydrolyzing plant fibers with acid. It mentions that sulfuric acid, hydrochloric acid, sulfurous acid, acetic acid, formic acid, oxalic acid and citric acid can be used, but the claims do not limit the type of acid , and there is no recycling of the catalyst
Chinese patent 200710037882.9 discloses a method for refining cellulose, lignin and xylose by utilizing biological raw materials, using organic acids with low boiling points to soak and pulverize the biomass raw materials to prepare xylose and xylooligosaccharides, the claims are low The boiling point organic acid is one or a mixture of trifluoroacetic acid and trifluoromethanesulfonic acid, but trifluoroacetic acid and trifluoromethanesulfonic acid are highly toxic, expensive, and difficult for industrial application

Method used

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  • Method for preparing xylose and arabinose by hydrolyzing lignocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Get dry corn cob (containing hemicellulose 36%, cellulose 41.2%, lignin 6.1%, other composition 16.7%), cross 20 mesh standard sieves after pulverizing, get 4g corn cob powder and join in the hydrolysis reactor, then Add 30mL of 3% oxalic acid solution, stir and mix, heat up to 125°C, and react for 120min. Filtrate with a Bush funnel to obtain 24.3 mL of hydrolyzate, and analyze the concentrations of xylose and arabinose to be 3.15% and 0.88% respectively; wash the filter cake 5 times, further recover xylose, arabinose and oxalic acid remaining in the xylose residue, and analyze the filtrate After concentration, the yields of xylose and arabinose were calculated to be 17.07% and 3.31%, respectively.

[0029] Add 0.73g of calcium hydroxide to the hydrolyzate in the neutralization tank to generate calcium oxalate precipitate, filter and wash 3 times, further recover the residual xylose and arabinose in the xylose residue, and then add the filter cake to 30mL of 3.3% Stir...

Embodiment 2

[0032] Take dry sweet sorghum slag (containing 34.57% of hemicellulose, 39.07% of cellulose, 13.29% of lignin, and 13.07% of other components), pass through a 20-mesh standard sieve after crushing, and add 4g of sweet sorghum straw powder into the hydrolysis reactor , and then add 20 mL of 5% oxalic acid solution, stir and mix, heat up to 130° C., and react for 50 min. Filtrate with a Bush funnel to obtain 14.7 mL of hydrolyzate, and analyze the concentrations of xylose and arabinose to be 2.14% and 0.53% respectively; wash the filter cake 5 times, further recover xylose, arabinose and oxalic acid remaining in the xylose residue, and analyze the filtrate After concentration, the yields of xylose and arabinose were calculated to be 15.2% and 1.71%, respectively.

[0033] Add 0.82g of calcium hydroxide to the hydrolyzate in the neutralization tank to generate calcium oxalate precipitate, filter and wash 3 times to further recover the residual xylose and arabinose in the xylose r...

Embodiment 3

[0036] Take 3g of corncob powder and add it into the hydrolysis reactor, then add 30mL of 4% oxalic acid solution, stir and mix, raise the temperature to 140°C, and react for 35min. Filtrate with a Bush funnel to obtain 24.4 mL of hydrolyzate, and analyze the concentrations of xylose and arabinose to be 3.45% and 0.94% respectively; wash the filter cake 5 times, further recover xylose, arabinose and oxalic acid remaining in the xylose residue, and analyze the filtrate After concentration, the yields of xylose and arabinose were calculated to be 18.67% and 3.55%, respectively.

[0037] Add 0.75g of calcium hydroxide to the hydrolyzate in the neutralization tank to generate calcium oxalate precipitate, filter and wash 3 times to further recover the residual xylose and arabinose in the xylose residue, then add the filter cake to 3.3% Stir and react in 30 mL of sulfuric acid solution for 0.5 h, filter and wash the filter cake 3 times to further recover the residual oxalic acid in ...

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Abstract

The invention discloses a method for preparing xylose and arabinose by hydrolyzing lignocelluloses in the technical field of biological engineering. In the method, aqueous oxalate solution is used for carrying out catalytic hydrolysis on crushed lignocelluloses; lignocelluloses hydrolysate solution and xylose resides are obtained by solid-liquid separation after the reaction; the hydrolysate solution is neutralized to obtain oxalate sediment and obtain solid oxalate by solid-liquid separation again; the oxalate reacts with sulfate in an acidizing tank for regeneration to obtain the aqueous oxalate solution; the oxalate solution is used repeatedly to catalyze next batch of lignocelluloses raw material. The invention uses oxalic acid as organic acid catalyst and has the advantages of high conversion rate, strong selectivity, less side reaction, being capable of recycling, and the like, the oxalic acid can replace regular inorganic acid catalyst, and the invention solves the problem thatthe traditional technology has equipment erosion, evaporating equipment scaling, serious pollution and the like and can be used for hydrolyzing the hemicellulose in lignocelluloses raw material and used for preparing the xylose and the arabinose.

Description

technical field [0001] The invention relates to a method for preparing xylose and arabinose by hydrolyzing lignocellulose, belonging to the technical field of bioengineering. Background technique [0002] Lignocellulosic biomass mainly includes agricultural biomass and forestry biomass, such as crop stalks, corncobs, bagasse, fruit stones and sawdust, which are mainly composed of hemicellulose, cellulose, lignin and a certain amount of other components composition. Among them, hemicellulose refers to those polysaccharides linked to cellulose in a non-covalent manner, with a high degree of branching, mainly composed of polypentose, polyhexose and polyuronic acid, and its content accounts for 10% of wood fiber. 19%-35% of vegetarian raw materials. Hemicellulose can be hydrolyzed to obtain xylose, arabinose and galactose. my country produces up to 700 million tons of agricultural waste every year, most of which are incinerated or discarded, which wastes a lot of useful resou...

Claims

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Application Information

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IPC IPC(8): C07H3/02C07H1/00
Inventor 李十中刘学军李天成
Owner TSINGHUA UNIV
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